The existing analogies between the Lienard-Wiechert electromagnetic field (LWF) produced by a moving charge and the Robinson-Trautman solutions (RT) of general relativity are further enlarged by showing that the Petrov type of the bounded part of an LWF is the same as that of a generic RT solution. We argue that it is possible to define an electromagnetic conformal tensor by using a superpotential previously found for the LWF. The conformal tensor so constructed allows us to 'Petrov-classify' that part of the LWF.